Temperature-programmed sulfiding of precursor cobalt oxide genesis of highly active sites on sulfided cobalt catalyst for hydrogenation and isomerization

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90257-I· OSTI ID:7161988

Inamura, Kazuhiro; Takyu, Toshiyuki ^[1]; Okamoto, Yasuaki; Nagata, Kozo; Imanaka, Toshinobu ^[2]

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1. Idemitsu Kosan Co. Ltd., Chiba (Japan)
2. Osaka Univ. (Japan)

It was found that the method of sulfidation of cobalt oxide strongly affects the catalytic activities and selectivities of the resultant cobalt sulfide catalyst, as well as the calcination temperature of the cobalt oxide. When cobalt oxide was sulfided at 673 K by a temperature-programmed sulfiding method (a heating rate of 6 K/min), catalytic activities for the hydrogenation of butadiene and the isomerization of 1-butene were considerably enhanced compared with those for cobalt sulfide prepared by isothermal sulfidation at 673 K. Results of temperature-programmed sulfiding (TPS), temperature-programmed reduction (TPR), and X-ray diffraction (XRD) suggest that the catalysts showing high catalytic activities after sulfidation are partially sulfided at 673 K and consist of the unsulfided cobalt core phases (CoO or metallic Co). The sulfidation property of precursor cobalt oxides has been studied using TPS, simulating the sulfidation process of the cobalt sulfide catalysts. Two distinctly different kinds of sulfidation process are estimated by TPS measurements of the cobalt oxides. The calcination temperature of the precursor cobalt oxides strongly affects the sulfidation paths. They are differentiated in terms of the presence of a metallic Co intermediate. The relationship of the mechanism of sulfidation of the cobalt oxides to the generation of highly active sites is discussed.

• OSTI ID: 7161988
• Journal Information: Journal of Catalysis; (United States), Vol. 133:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
BUTADIENE
HYDROGENATION
BUTENES
ISOMERIZATION
COBALT OXIDES
SULFIDATION
COBALT SULFIDES
CATALYTIC EFFECTS
CALCINATION
CATALYSTS
CHEMICAL REACTION KINETICS
COBALT
CORRELATIONS
HEATING RATE
PETROLEUM
PHASE STUDIES
REDUCTION
TEMPERATURE CONTROL
X-RAY DIFFRACTION
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COHERENT SCATTERING
CONTROL
DECOMPOSITION
DIENES
DIFFRACTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
KINETICS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYENES
PYROLYSIS
REACTION KINETICS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing